I need some advice and tips on gaining better gear

Im a 434 Warlock atm. It has been really slow on getting better gear, goal would be 450il and than 470.

So basically starting a mythic +0 dungeon is really slow and than to getting the first key and after that having the luck of getting a key not to the same dungeon.
I cant do raids because nobody joins, i cant join raids because nobody accepts 434il demologylock,
So its like, what to do to get more gear so you could be more useful and acceptable.

This could be my fault but wow in later expansions isnt too clear on getting better armor or weapons, yes there are drops or quests but most of them are low il.
heck, my weapon is 415il.

Is there something that i missed in the start of shadowlands?
i did get the [Ashjra’kamas, Shroud of Resolve] cape but is there more.

That’s a great idea! Check out the guild recruitment page over on https://eu.forums.blizzard.com/en/wow/c/recruitment/54 . It can’t be stressed enough that being nice, patient, and polite in the mythic groups will generate connections that can flourish into friendships.

While it does take a little effort to stay connected with these new people till a rapport is built and you start to do things together regularly, increasing your social circle is an excellent way to find like-minded folks to run with. You might even have real life friends who play that you didn’t even know about! Try announcing on your social media that you’re looking for buddies to roll with Maybe you’ll even find some folks you know who don’t play WoW (or game in general) who’re looking scratch that social itch. Be pro-active. It’s good to reach out!