Ganon isn't a particularly good main anyways, honestly.
Hate to say it but the slower characters aren't having much justice done for them. Faster characters will pretty much get the advantage in all cases but damage and knockback (which are easily bypassed anyways).
Easier to use characters are always going to be used so you either have to play an easy to use character, develop skill and techniques with your low-tier, or play a higher-tier character that takes a shred of skill to play.
I don't play Ganon but I'd say work on your timing and use your least punishable attacks to build up some damage.
yeah see that's why i'm trying to get into using mario and kirby which are both moderately fast and good characters but i'm still not very good with either of them
i've always known that heavy characters are never really used in any fighting game simply because their benefits are outweighed by their disadvantages but i cannot say ganon isn't a good character, and i seriously am not saying this because i use him, i know dedede (sorry destroyerofblocks), wario and bowser are pretty bad but i swear
on me mum people are just not using ganon because he's slow when he's a great character
honestly i just saw my brother using ganon, thought he looked pretty fun, and now he's my main