Wow, you are in dangerous territory now. Licensing covers? No, no, no. Again, no.
Anyone can MAKE a cover and sell on Spotify (with the right license and royalties to the songwriters) for listening purposes, but licensing is a whole different thing. You can get in a lot of legal trouble.
As for the quality of the tracks, well, they would need a lot of work to be accepted here. The sounds, playing, mixing, mastering. Everything needs to be improved quite a bit. But just keep going, make more music.
And don’t license covers (unless they’re public domain).