I was a wanky "attachment parent" for my older BS, and there are whole books on "attachment parenting" aimed at birth children, but the ideas are transferable. Look at William Sears etc.
With adopted DS, we shower together and swim to get skin to skin. I try and make bottle feeding as like breastfeeding a newborn as I can (without sneakily reading mumsnet on my iphone as I did when I had a birth newborn). Lots of pretending he is newborn, so cuddling, gazing into his eyes telling him he's beautiful etc. I use a sling, and carry on my front when my back allows, otherwise on my back. Use a parent facing pushchair. Co-sleeping really helps, so if I feel the attachment thread is straining a bit, I do bring him in to my bed. Responding to every moan in the night, so he knows I'm there if he needs me (this is hard, and the one I'm most likely to let slide!) Tickling games, and trust games like songs that involve being lifted up or down etc. Massage. I have his rear facing car seat in the front passenger seat, so he can always see me, and if we're stuck in traffic, I can do a bit more gazing or funny faces. Rear facing in the passenger seat with the air bag off is safe, safer than front facing in the back, but people will think you're odd. Funneling of course. Sitting looking at books is good for us.
But, I would advise not beating yourself up if some of these things slide. They're tools, not rules, and I think a hit rate of 70% of good attachment building at each opportunity will be enough. That's not evidence based, but I'm not superwoman! I think I get that idea from the need to be a 'good enough;' parent 70% of the time.
Real attachment parenting is EXHAUSTING. So, do whatever you need to to look after yourself.