I've found no significance reward for Moses dedicated service, neither for his descendants unlike Aaron that got almost, if not all the blessings in
Numbers 18:8-20. My question is, are there any significance reward given to him and his descendants?
Remember that Moses and Aaron were both Levites from the Kohathites (Ex 6:16,18, 20). So any of Moses' children would have also been Kohathites and had similar privileges but just not the priesthood.
Moses also had the singular privilege of witnessing God's glory (Ex 33:18-23). He also was the mediator of the Law covenant (Ex 24:3-8). He oversaw the building of the tabernacle of which the pattern was given to Moses by God himself (Ex chaps 25-29; Le chaps 8,9). And most significantly, Moses spoke to God "face to face" (Nu 12:6-8).