Zikr & Dua

Q: This last year has been a pretty rough patch right up until now. I used to do the the bear minimum, 5 times salaah, smile, talk good to people. 

Ramadaan time this year was the first year that I woke up for tahajud every single day, making dua and asking Allah for certain things, asking for forgiveness, etc. But I feel like none of the duas have gotten accepted. 

Even now, I still feel like my duas are not being accepted. Please assist. 

Q: 

1. Is it permissible to play Roblox while doing dhikr in one's mind to avoid wasting time? Though at times one may forget to do so. Some aspects of the game include: 

• Free mixing. Avoidable, though a non mahram may approach. 
• Clothing (for the characters) that are inappropriate in front of non mahrams. Avoidable. 
• Players using heads and faces (can lead to exposing images of animate beings from one's device.) 
• Games that include impermissible aspects. Avoidable. 

So, the Haram aspects can be avoided In shaa Allah, but other players can engage in it. 

Also, the game consists of a variety of other games (exploration games, designing outfits, maybe riddles or the like etc.). 

2. Is it permissible to replace the head using some other object like a watch, flower, planets etc. as long as it doesn't have a face or isn't the head of an animal or person? 

3. If a non mahram approaches me and I leave the game soon/quickly afterwards without saying anything, is it permissible?

Q: If I want to marry someone, can I make dua to marry them taking their name?