I would promote the same advice, try lower wattage, see what works for you.
When I used a tank with coil heads (similar to yours), I'd start getting a slightly burnt taste after 2 days when I was chain vaping long draws. So I just took shorter puffs, and the coils would last 4 to 5 days, when I'd get a burnt taste even with a short puff, it was time to change the coil.
If you're not into clouds, you could try shorter draws with a higher nicotine concentration, you'd get your fix and burn through e-juice and coil heads slower. Note that less clouds will usually mean less flavor. BUT, you could also increase flavor by reducing the airflow (I don't know your tank but on virtually all of them, you have a stainless steel ring you can turn to open or close air holes). Mind the wattage as well when reducing airflow, as the vape will get warmer.
Try different airflow/wattage settings to find what you really like. Some (as myself) like clouds, some like flavor, some just want a nicotine fix. There's no right or wrong answer, only what works for you. If your current vape is what you really want, though, you will burn through coils quite fast, and I don't think there's something to do that will drastically improve your coil heads' life.
Budget is something I was also concerned with when I realised how fast I would ruin a coil head, and at this point I started considering rebuildable, though you may benefit some "regular" vape experience first. Do some reading and find out if this is something you could enjoy. You don't have to build your coils, it's just an option, but it's one hell of an economic option!
The other thing you can save money on is e-juice. Making your own is actually really easy, and you don't need experience to achieve it!
DIY e-juice costs much less than regular e-juice, and you get to chose the PG/VG ratio, with any flavoring you like (most e-juice are also available as flavorings for you to make your own).
You can ask about it at your local vape store, or browse the forum, there are tons or articles, more or less technical, from which you can learn all the basics. Most stores sell e-juice base, nicotine boosters, and flavorings, as well as graduated bottles for you to make accurate mixes.