Sounds a bit like you’ve done everything solo, and want to continue doing it that way.
Which is fine, but realistically you SHOULD expect things to be difficult solo, and as someone thats struggled to find the right group to fly with myself, im personally glad higher end content is becoming more challenging.
I can still do lvl 4 missions solo if I choose. I can still explore in LS/WH etc. I can run escalations solo. There’s a lot you can still do, but you’re going to need to expand your horizon and do content appropriate to the resources you have.
Without being part of a small group that works together for everyone’s benefit, you’re going to have a steep barrier for content.
Personally I still hate seeing holding corps for upwell structures. Keep it tied to your corp/alliance or don’t put 'em up.
As a HS player beginning to branch more into consistent LS play, try something different. Its not all about isk/hr. If that is how you define fun, unfortunately for you, but fortunately for the game, ISK is going to be harder to come by staying in HS.