Trees should not look like telephone poles coming out of the ground. Trees in the forest have a swelling where roots join the trunk that is visible at the soil surface. This root flare should be visible on trees planted in your landscape. If trees are planted too deep, the normal root flare does not develop at the surface and trees can begin to decline. Decline may begin at planting or it may not show up for many years. Tree roots need to breath (respire) and exchange gases(respire) and exchange gases passively through bark, lenticels, and root hairs.
Roots respiration (gas exchange) takes place within few inches of the soil surface. Roots are injured or killed when the exchange of oxygen and carbon dioxide is restricted. The fabric  under the wood chips may be reducing the movement of water, oxygen, and carbon dioxide. It is better to place the wood chips directly on the soil. Try to find the root flare on both trees. This is the area of the trunk where it get wider. The root flare is the place where the top most place root emerges from the trunk. The picture looks like your trees may be planted to deeply. Remove the excess soil and mulch to expose the root flare. The root flare may be several inches. Excavating the soil may expose a web of irregular and damaging girdling roots. Stem girdling roots are commonly removed by using wood gouges, saws or pruners if they have caused minimal stem compression.Read more about stem girdling roots.
https://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/pests-and-problems/environmental/girdling.aspx If you want to hire an arborist to do this work the following site will explain how to hire one.

https://extension.umn.edu/planting-and-growing-guides/how-hire-tree-care-professional
Moss is an opportunistic plant that will grow where turf grasses are thin and weak. Moss does not persist in stands of dense, vigorously growing turf. Moss thriving in lawns signals that grass is weak and has thinned for some reason, allowing the moss to take over. There are many potential causes, including excessive shade, compacted soils, poorly drained soils, low soil fertility, high or low soil pH, and poor air circulation. Prune your trees to improve air circulation, and light penetration Evaluate lawn care procedures, especially nitrogen fertilizer. The best time is early August through mid October.
Excessively short mowing may be a source of the moss problem. Mow at a height of 3 -3.5 inches. Mow on a regular basis (based on rate of lawn growth) to avoid removing more than one-third of the leaf blade. For shady locations, look for seed mixtures specifying shade tolerance. These will contain fescues along with some common and shade-tolerant Kentucky bluegrasses. Mow as high as possible if your lawn is in shade, return grass clippings to the lawn, and keep your mower blades sharp. Read about lawn care and moss problems.

https://blog-yard-garden-news.extension.umn.edu/2019/06/essential-tips-for-healthy-lawn-part-i.html

https://blog-yard-garden-news.extension.umn.edu/2019/07/essential-tips-for-healthy-lawn-part-ii.html

https://web.extension.illinois.edu/lawntalk/weeds/solving_moss_problems_in_lawns.cfm

The best time to reseed your lawn is in late August to mid September.