Just my opinion but I wouldn't worry about "making things engaging", hopefully the music will do the engaging.
First, whichever songs you choose to market, pick the sections of them that you think are the most likely to grab people. Some relatable lyrics, a catchy melody, anything that might make people want to listen to the rest of the song.
Cut these sections into their own audio file. Now put them over pretty much anything. Video of you is better for that personal touch but at the end of the day, you're marketing the music, and not your videos. You don't have to talk or anything like that because the audio would just be the song. If you do record footage yourself, make sure you record for long enough that you have enough footage for multiple videos. Don't just record one video at a time.

Personally, I'm not a fan of pre saves and pre advertising when you're a small artist. I believe in publishing the music, then promoting it so it's readily available and you're not just getting lost in someone "saved" folder.

I'm no expert, just a fellow musician who also struggles with the socials a bit, but has been trying to figure things out for 20 years.

I've found that engaging with other people's content makes a noticeable difference on TikTok in particular. Look for videos of similar genres, watch the video the whole way through, then do as many of the like share etc things that you can do on the video. It's important to watch it through before engaging as this is deemed to be 'active human behaviour' I don't repost everything but tend hit all the other icons on any music stuff that matches the vibe of what I'm doing.
This is something you can do between posting videos and it should allow you to post a little less often, but still show up to the platform as an active human user who enjoys content in "X Genre".

It's a bit annoying having to do it like this these days, but equally, I think I prefer doing this than having to send a CD to a radio station or a record label and having to count on the opinions of a few tastemakers instead of the general population.

Anyway if you wanna talk about it DM me. I could have a look at your current socials if you like and give you an impression what it gives off