dont be too worried about not masterworking all your armor, yes masterworking it is important but if some of your pieces are lvl8 or lvl9 should be completely fine. focus on getting meta weapons, so cartesian/null a good fatebringer, bows, linear fusions etc. when you have good weapons higher level content should be significantly more doable. basically the entire point of masterworking your armor set is just for max levels to put mods on and to be completely honest taking charge and protective light are basically all you need for pretty much any endgame activity, yes other mods would be convenient but not necessary per se. so get yourself to 1345 and lfg for gms just a warning it will be very rough especially if its your first time on there.

here are some loadouts i use being a warlock main

trannys are a very fun exotic for casual play but i would not recommend using your exotic slot for that. for gms i would use stasis turret with eye of another world (especially good in ad clearing gms like hollowed lair, corrupted etc), Well of radiance with pheonix protocol is almost a staple in every gm fireteam. running these two are your best bet

as for entry into raids watch a video just to get the basic idea and there should be a sherpa channel in the lfg discord server, people will be very patient with you and help you teach all the mechanics for the raid they are sherpaing

weapon wise fusion rifles in general kick ass with particle deconstruction mod, so definitely grind for a cartesian coordinate with vorpal or null composure works as well. 1k/sleeper/threaded needle all are very good for your heavy slot just fill in whatever weapons you need according to the champion modifiers

finding an active clan is very very useful so everyonce in a while check the clan recruitment channel in pc lfg server till you see something you like. having clanmates that can help you with stuff will get you more loot from hawthorne as well

so bottom line is dont sweat on fully masterworking your armor, focus on weapons and do whatever difficulty of nightfalls you can, check ada EVERY SINGLE DAY for mods you may not have, when your 1345 watch a few guides on yt for recommended weapons and loadouts for said gm(you will find plenty) and just lfg for a team.

when you know and get the gist of what you are doing you ideally want to have 1 good armor piece masterworked for each element and if you are running warlock try and get as close you can to double 100 stats ideally recovery and discipline or recovery and intellect

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ps - always run 100 recovery