Feeling roster stagnation and looking for advice

A few months ago I champed my first 2 5* characters and I was well on my way to having the entire cast of 4* characters champed as well. When they changed the 4* draw odds of the LLTs it immediately brought my 4* growth to a grind and 5* growth has generally been a grind as well. Typically I open LLTs as soon as I get them and I buy 5* covers from the H4H store if the cost is 250 CP and I happen to need that cover.
Does anyone have any ideas for better ways for me to grow my 4* & 5* rosters? Should I just stop opening the LLTs and stockpile until I have 300 and then open them all or is there any other way to more effectively use LLTs and grow the 5* characters.
Does anyone have any ideas for better ways for me to grow my 4* & 5* rosters? Should I just stop opening the LLTs and stockpile until I have 300 and then open them all or is there any other way to more effectively use LLTs and grow the 5* characters.
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Ugh, it seems like the game is just broken if I can't cover my older 5* characters. Any player that wasn't able to champ Gambit is essentially behind the 8 ball for their lifetime as a player until they make a character that is more powerful than Gambit...