internet plan that includes home internet and cellular. (FPS Gaming at home and less Cellular) ?

Hello, I am using UQ for my cellular (number + Cellucar 35G? for around 3800 – 5000 ¥ ish) and DOCOMO's home wireless router for wifi (3249¥ /m )

so totally around 7000~10000 ¥ per month will be charged.

I found that my condition is that I stay most of the time either at home or in the office so that I have WIFI with me, so my cellular is not used that often, (I came out that I always leave the data usage for the next month and I can't use them all, which is such a waste)

And since I've got my gaming pc at home and I want to have a smooth internet gaming experience, I wonder if there's any plan that covers both but I can have less usage on my smartphone and faster home internet (with LAN not the WIFI router?)

I'm not worry about my phone cellular because I am not a heavy user, but I do care about my speed at home,

the currently speed ( wifi router based, and a LAN wire connected from my PC to the router)
tested DL 190 Mbps, UpL 4.4Mbps ), So I sometimes get high ping / lagged when playing FPS games at night (when it's at the peak time of internet use)

Is there somebody ever had similar situation / condition like me?

(I am living in an rented Apart)

I want to hear about your experience and advice, Thank you in advance!