I think different people show their love in different ways so just find what works for you. Looking back, my grandad danced with me and would spend hours playing dress up or listening to music and telling stories, my nan wrote me special bedtime stories about a little girl who went on different adventures, my grandma was/is a bit more tough love but she used to buy special chocolate ice creams she knew I liked and had a special mug for me to use when i visited, my other grandad had dementia but used to collect up stamps and send them through to me, my dad took lots of photographs and videos and wanted to encourage me to learn about the world so introduced me to home made science experiments, helped me research school projects and would take us to museums or historical sites. My mum would always read at bedtime and sing songs to us and all we didn't have much money, tried to make life fun and exciting - long walks, different playgrounds, picnics in the garden, themed teas for special days like Halloween, Valentine's, easter, christmas, pancake day. She encouraged us to celebrate and enjoy life.
As I grew older, both mum and dad encouraged my independence - giving me control of my money, encouraging me to save and budget (I was responsible for buying my own clothes from 13), letting me go out with friends, insisting on buying me a phone so I could easily keep in touch and let them know where I was, fighting for dental treatment they knew I needed, helping me find a Saturday job, continuing to support my studies and encourage revision, but also encouraging me to go out and have fun.
It is difficult to quantify love, and I think if someone loves you it just shines through. I think they focus on you and your interests, make you feel special and encourage / celebrate your achievements and development. I included the tangible things above as these are some of the special things I look back and remember, but these only really mean something to me.
You sound like a very loving mum, and I am sure your DC will have similar memories with you.
Ps. They were tough too - I was a stubborn child and we had a lot of difficult life experiences, life could be very sad and difficult. Both my parents had fiery tempers and I pushed them to the limit. They would shout, send me to my room and smack me. They carried through threats and we're always consistent and clear about consequences of any naughtiness. But they always told me they loved me, never went to sleep on an argument and would let things move on / return to normal quickly once I had apologised or calmed down. (Hope this gives a fair balanced view, and doesn't sound too rose tinted!)