I'd suggest 'Ao Haru Ride'. It shares similarities with 'True Love' in that it explores complex relationships and has a charming art style. The way the characters interact and grow is quite similar too.
You might like 'Kimi ni Todoke'. It shares the theme of building relationships and has a comparable light-hearted yet touching tone like Love Junkies.
I think 'Spirit Away' could be similar. It has elements of supernatural love and a unique art style.
You might like 'Emotional Encounters'. It's similar in that it delves deep into the complexities of love and has a similar artistic tone. The characters' development and story arcs could give you the same kind of enjoyment as 'The Love Doctor'.
One manga similar to Haikyuu could be 'Kuroko's Basketball'. It also focuses on team sports and has dynamic characters and intense competitions.
One manga that could be similar is 'Desire'. It shares a similar emotional depth and exploration of complex desires, like in 'Craving'.
One manga similar to 'Oyasumi' could be 'Yume Miru Kikai'. It shares a similar dreamy and somewhat mysterious style.
One manga that comes to mind is 'Parasyte'. It shares similar elements of mystery and survival like 'Thirst'.
There are a few like 'Storm and Silence' and 'Cloudy Skies'. They share similar emotional depth and artistic styles with 'Rain'.
Well, 'One Piece' could be similar. It has a diverse cast of characters and an adventurous theme like 'Rettou no'.
One manga that could be similar is 'The Guardians'. It shares a similar theme of heroism and a visually distinct style.