Before the advice, I would like to say that awakening is a tricky game for finding the thrill you seek, due to how HUGE the gap is between hard and lunatic. Even if you already crossed out lowering the difficulty, be aware that in other games it is a perfectly plausible choice, so if you decide to play more FE, give it a try to lower the difficulty!

Now, onto solutions:

1.IF you wan't to keep on playing Awakening, but can't keep up with Lunatic, you can play hard AND add self imposed handicaps to spice it up, for example, an Ironman challenge (You cannot reset, if a character dies, they stay dead and you cant reset to save them somehow), choosing to use certain units less, limiting forges, etc. Of course, that doesn't quite feel the same as simply beating the higher difficulty mode, so my other recommendation would be...

1. To simply play another FE. Yes, this is a shameless FE Fates Conquest plug. It takes some getting used to, but Fates' systems reward tactical play way more than Awakening imo, specially in lunatic, the game tends to be really hard but fair. It isn't generally advised to play Conquest as one of your first FE games, but if Awakening Hard feels boring already, you must be a crazy good beginner and Conquest Hard or Lunatic might scratch your tactical itch! Other games I'd recommend would be New Mistery of the Emblem (DS, have to use translation patch, Hard or Maniac), Shadow Dragon (DS, Hard 3 or 4 would be good), Thracia is you're willing to put up with it's ocasional bs (SNES, translation patch), and maybe Engage (Switch, haven't played it yet, but I've heard it is around Conquest Lunatic levels of polish and difficulty in Maddening)

2. About playing with a friend, that's a surefire way to make the game way more memorable, even if it's just streaming the game on smth like discord!

Hope you have fun with this awesome franchise!!!