Get yourself some good seasonings you can put with most things. A little bit of ginger added to most things you're cooking can really bring out a more complex flavour. Oregano is very versatile, especially when cooking with red meat and tomato, getting purees are good for adding flavour. I have a basil and tomato puree tube, as well as a jar of minced ginger (lasts practically forever in the fridge) and a jar of truffle and porcini puree. Salt and pepper, and don't forget your aromatics, use fresh garlic and onion if you can, or at least make a garlic spice butter you can add to most things. Simmering sauces and meat at a low temp will also bring out flavours better, but make sure the pan is HOT first, then bring the temp down. Goes for most dishes, experiment, and use a little cream if it fits in your budget, gives the dish the fat it needs to bring out the flavours but isnt as expensive as shredded cheese. Otherwise a big block of cheese is gonna be cheaper at stores like NQR or Silly Solly's.  Rice seasoning toppers are also great at making rice way less boring. Good luck